Investigaciónhttp://hdl.handle.net/10578/8
Artículos, ponencias, comunicaciones.Thu, 21 Mar 2019 18:15:36 GMT2019-03-21T18:15:36ZElectrochemical performance of activated screen printed carbon electrodes for hydrogen peroxide and phenol derivatives sensinghttp://hdl.handle.net/10578/20331
Electrochemical performance of activated screen printed carbon electrodes for hydrogen peroxide and phenol derivatives sensing
González Sánchez, Maria Isabel; Gómez Monedero, Beatriz; Agrisuelas, Jerónimo; Iniesta, Jesús; Valero, Edelmira
Screen-printed carbon electrodes (SPCEs) are widely used for the electroanalysis of a plethora of organic and inorganic compounds. These devices offer unique properties to address electroanalytical chemistry challenges and can successfully compete in numerous aspects with conventional carbon-based electrodes. However, heterogeneous kinetics on SPCEs surfaces is comparatively sluggish, which is why the electrochemical activation of inks is sometimes required to improve electron transfer rates and to enhance sensing performance. In this work, SPCEs were subjected to different electrochemical activation methods and the response to H2O2 electroanalysis was used as a testing probe. Changes in topology, surface chemistry and electrochemical behavior to H2O2 oxidation were performed by SEM, XPS, cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. The combination of electrochemical activation methods using H2SO4 and H2O2 proved particularly effective. A reduction in charge transfer resistance, together with functionalization with some carbon-oxygen groups on carbon ink surfaces, were likely responsible for such electrochemical improvement. The use of a two-step protocol with 0.5 M H2SO4 and 10 mM H2O2 under potential cycling conditions was the most effective activation procedure investigated herein, and gave rise to 518-fold higher sensitivity than that obtained for the untreated SPCEs upon H2O2 electrooxidation. The electrochemical behavior of acetaminophen, hydroquinone and dopamine is also shown,as a proof of concept upon the optimum activated SPCEs.
Tue, 01 Jan 2019 00:00:00 GMThttp://hdl.handle.net/10578/203312019-01-01T00:00:00ZMEdit4CEP-CPN: An approach for complex event processing modeling by prioritized colored petri netshttp://hdl.handle.net/10578/20312
MEdit4CEP-CPN: An approach for complex event processing modeling by prioritized colored petri nets
Boubeta Puig, Juan; Díaz, Gregorio; Maciá, Hermenegilda; Valero, Valentín; Ortiz, Guadalupe
Complex Event Processing (CEP) is an event-based technology that allows us to process and correlate large data streams in order to promptly detect meaningful events or situations and respond to them appropriately. CEP implementations rely on the so-called Event Processing Languages (EPLs), which are used to implement the specific event types and event patterns to be detected for a particular application domain. To spare domain experts this implementation, the MEdit4CEP approach provides them with
a graphical modeling editor for CEP domain, event pattern and action definition. From these graphical models, the editor automatically generates a corresponding Esper EPL code. Nevertheless, the generated code is syntactically but not semantically validated. To address this problem, MEdit4CEP is extended in this paper by Prioritized Colored Petri Net (PCPN) formalism, resulting in the MEdit4CEP-CPN approach. This approach provides both a novel PCPN domain-specific modeling language and a graphical editor. By using model transformations, event pattern models can be automatically transformed into PCPN models, and then into the corresponding PCPN code executable by CPN Tools. In addition, by using PCPNs we can compare the expected output with the actual output and can even conduct a quantitative analysis of the scenarios of interest. To illustrate our approach, we have conducted an air quality level detection case study and we show how this novel approach facilitates the modeling, simulation, analysis and semantic validation of complex event-based systems.
Wed, 22 Nov 2017 00:00:00 GMThttp://hdl.handle.net/10578/203122017-11-22T00:00:00ZGeneric Type 3 WT models: comparison between IEC and WECC approacheshttp://hdl.handle.net/10578/20292
Generic Type 3 WT models: comparison between IEC and WECC approaches
Lorenzo Bonache, Alberto; Honrubia Escribano, Andrés; Fortmann, Jens; Gómez Lázaro, Emilio
The widespread use of renewable energies around the world has generated the need for new tools and resources to allow them to be properly integrated into current power systems. Power system operators need new dynamic generic models of wind turbines and wind farms adaptable to any vendor topology and which permit transient stability analysis of their networks with the required accuracy. Under this framework, the International Electrotechnical Commission (IEC) and the Western Electricity Coordinating Council (WECC) have developed their own generic dynamic models of wind turbines for stability analysis. Although these entities work in conjunction, the focus of each is slightly different. The WECC models attempt to minimise the complexity and number of parameters needed, while the IEC approach aims to optimise comparison with real
turbine measurements. This study presents a detailed comparison between these two different approaches for modeling a Type 3 (i.e., DFIG) wind turbine in MATLAB/Simulink. Finally, several simulations are conducted, with which the consequences of the different approaches are evaluated. The results of this paper are of interest to power system operators as well as wind turbine manufacturers who require further assistance in adapting their specific models to the simplified versions provided by the International Committees.
Tue, 01 Jan 2019 00:00:00 GMThttp://hdl.handle.net/10578/202922019-01-01T00:00:00ZField Validation of Generic Type 4 Wind Turbine Models Based on IEC and WECC Guidelineshttp://hdl.handle.net/10578/20291
Field Validation of Generic Type 4 Wind Turbine Models Based on IEC and WECC Guidelines
Lorenzo Bonache, Alberto; Honrubia Escribano, Andrés; Jiménez Buendía, Francisco; Gómez Lázaro, Emilio
The generic wind turbine models developed in recent years by the International Electrotechnical Commission (IEC) and the Western Electricity Coordinated Council (WECC) are intended to meet the needs of public, standard, and relatively simple (small number of parameters and computational requirements) wind turbine and wind farm models used to conduct transient stability analysis. Moreover, the full-scale converter
(FSC) wind turbine technology referred to as Type 4 by IEC and WECC, is increasingly used in current power systems due to its control benefits. Hence, the development of this generic model has become a priority.This study presents the validation of two generic Type 4 wind turbine models, which have been developed in accordance with the IEC and WECC guidelines, respectively. Field data collected from a real wind turbine located in a Spanish wind farm was used to validate both generic Type 4 wind turbine models following the IEC validation guidelines. Ten different test cases are considered, varying not only the depth and duration of the faults but also the load of the wind turbine. The parameters of the models were kept constant for all the simulation cases, aiming to evaluate the accuracy of the models when facing different voltage dips.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/10578/202912018-01-01T00:00:00Z